Hip
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Viral infections were presumed, not causal, as soon as someone sees high titers to a virus they assume it is their cause, it has been like this for years within the ME/CFS community now, how many ME/CFS patients have been told it is Lyme disease.
In the case of enterovirus, it is not only chronically high antibody levels, but you also find this virus as a low-level infection if you perform PCR tests on tissue (not the blood), like on stomach biopsies, or muscle biopsies.
Many British studies found enterovirus in ME/CFS patient muscle tissues, and Dr John Chia found enterovirus in the stomach tissues. However, these tissue infections are also sometimes found in healthy controls, which suggests on their own, they may not trigger ME/CFS.
But there are theories like the immune priming theory of ME/CFS, which posit the immune system may be hyper-sensitized in ME/CFS, so that the immune response to a low-level enterovirus infection may be disproportionately high and exaggerated.
Interestingly, in studies on immune priming, when immune cells are pre-exposed to LPS, they can subsequently become hyper-sensitized and mount exaggerated responses.
So LPS leaking into the bloodstream from a low-level kidney infection (or perhaps from leaky gut), might hyper-sensitize the immune system, so that later when a virus comes along, the immune response to even a low-level viral infection is very large, leading to ME/CFS symptoms.
A Simon McGrath Phoenix Rising article on the immune priming theory of ME/CFS is found here. I wrote this post on immune priming.